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Fairchild Semiconductor
Fairchild Semiconductor

CQ0765RT Datasheet

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www.fairchildsemi.com
FSCQ0765RT
Green Mode Fairchild Power Switch (FPSTM) for
Quasi-Resonant Switching Converter
Features
• Optimized for Quasi-Resonant Converter (QRC)
• Advanced Burst-Mode operation for under 1 W standby
www.DataSheet4Up.coowmer consumption
• Pulse by Pulse Current Limit (5A)
• Over load protection (OLP) - Auto restart
• Over voltage protection (OVP) - Auto restart
• Abnormal Over Current Protection (AOCP) - Latch
• Internal Thermal Shutdown (TSD) - Latch
• Under Voltage Lock Out (UVLO) with hysteresis
• Low Startup Current (typical : 25uA)
• Low Operating Current (typical : 4mA)
• Internal High Voltage SenseFET
• Built-in Soft Start (20ms)
• Extended Quasi-resonant Switching for Wide Load Range
Application
• CTV
• DVD Receiver
• Audio Power Supply
OUTPUT POWER TABLE
PRODUCT
230VAC ±15%(2)
Open Frame(1)
85-265VAC
Open Frame(1)
FSCQ0765RT
100 W
85 W
FSCQ1265RT
170 W
140 W
FSCQ1565RT
210 W
170 W
Table 1. Notes: 1. Maximum practical continuous power
in an open frame design at 50°C ambient. 2. 230 VAC or
100/115 VAC with doubler.
Typical Circuit
Vo
Description
In general, Quasi-Resonant Converter (QRC) shows lower
EMI and higher power conversion efficiency compared to the
conventional hard switched converter with a fixed switching
frequency. Therefore, it is well suited for applications that are
sensitive to the noise, such as color TV and audio. The
FSCQ0765RT is an integrated Pulse Width Modulation
(PWM) controller and Sense FET specifically designed for
Quasi-resonant off-line Switch Mode Power Supplies
(SMPS) with minimal external components. The PWM
controller includes integrated fixed frequency oscillator, under
voltage lockout, leading edge blanking (LEB), optimized gate
driver, internal soft start, temperature compensated precise
current sources for a loop compensation and self protection
circuitry. Compared with discrete MOSFET and PWM
controller solution, it can reduce total cost, component count,
size and weight simultaneously increasing efficiency, produc-
tivity, and system reliability. This device is a basic platform
well suited for cost effective designs of Quasi resonant
switching flyback converters.
AC
IN
Sync
FSCQ0765RT
PWM
VFB Vcc
Drain
GND
Figure 1. Typical Flyback Application
©2004 Fairchild Semiconductor Corporation
Rev.1.0.1
Page 1

FSCQ0765RT
Internal Block Diagram
www.DataSheet4U.com
FB
4
Soft start
Sync
5
+
Threshold -
Quasi-resonant
(QR) switching
controller
4.6V/2.6V : Normal QR
3.0V/1.8V : Extended QR
Vcc
3
+
fs
- 9V/15V
Vcc good
Drain
1
VBurst
Burst mode
Controller
Normal operation
Burst Switching
Vref
IBFB
Vcc
Idelay
Vref
IFB
Vref
IB
OSC
PWM
SQ
Auxiliary
Vref
Normal
operation
Main bias
Internal
bias
VSD
Sync
Vovp
2.5R
R
Vcc good
RQ
LEB
600ns
SQ
RQ
QS
QR
Gate
driver
AOCP
TSD
Vocp
Power off Reset
2 GND
Figure 2. Functional Block Diagram of FSCQ0765RT
2
Page 2

Pin Definitions
FSCQ0765RT
Pin Number
1
2
3
www.DataSheet4U.com 4
5
Pin Name
Drain
GND
Vcc
Vfb
Sync
Pin Function Description
High voltage power SenseFET drain connection.
This pin is the control ground and the SenseFET source.
This pin is the positive supply input. This pin provides internal operating
current for both start-up and steady-state operation.
This pin is internally connected to the inverting input of the PWM comparator.
The collector of an opto-coupler is typically tied to this pin. For stable
operation, a capacitor should be placed between this pin and GND. If the
voltage of this pin reaches 7.5V, the over load protection triggers resulting in
shutdown of the FPS.
This pin is internally connected to the sync detect comparator for quasi
resonant switching. In normal quasi-resonant operation, the threshold of the
sync comparator is 4.6V/2.6V. Meanwhile, the sync threshold is changed to
3.0V/1.8V in extended quasi-resonant operation.
Pin Configuration
TO-220F-5L
5.Sync
4.Vfb
3.Vcc
2.GND
1.Drain
Figure 3. Pin Configuration (Top View)
3
Page 3

FSCQ0765RT
Absolute Maximum Ratings
(Ta=25°C, unless otherwise specified)
Parameter
Drain-Source (GND) Voltage (1)
Drain-Gate Voltage (RGS=1M)
Gate-Source (GND) Voltage
Drain Current Pulsed (2)
Single Pulsed Avalanche Energy (3)
www.DataSheet4UC.coonmtinuous Drain Current (Tc = 25°C)
Continuous Drain Current (TC=100°C)
Supply Voltage
Analog Input Voltage Range
Total Power Dissipation
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature Range
Thermal Resistance
Symbol
VDSS
VDGR
VGS
IDM
EAS
ID
ID
VCC
Vsync
VFB
PD
TJ
TA
TSTG
Rthjc
Notes:
1. Tj = 25°C to 150°C
2. Repetitive rating: Pulse width limited by maximum junction temperature
3. L = 21mH, VDD = 50V, RG = 25, starting Tj = 25°C
Value
650
650
±30
15
570
3.8
2.4
20
-0.3 to 13V
-0.3 to VCC
45
+150
-25 to +85
-55 to +150
2.6
Unit
V
V
V
ADC
mJ
ADC
ADC
V
V
V
W
°C
°C
°C
°C/W
4
Page 4
Part Number CQ0765RT
Manufactur Fairchild Semiconductor
Description Search -----> FSCQ0765RT
Total Page 24 Pages
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